METHOD.. The interval method differs from the vertical anglemethod only in the manner of determining elevations, these being obtainedby the gradienter instead of by the vertical arc. This method derives itsname from the fact that the space or interval between the upper and lowercross-hairs as read… … Fig. 12. head of the gradienter screw is noted. The line of sight is now representedin tig. 12 by AB. The gradienter screw is turned through two complete revo-lutions, and the point B moves to 0, the distance BC being an interval,Four revolutions move the line of sight through two mors intervals,…
Surveying · Theses
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